Reasonable Malaria Fix 1.0.10
The issue with malaria in 1.0.10 is that it is applied to all of Africa instead of just Sub-Subsaharan Africa. Yes, milder strains of malaria were endemic in North Africa and most of the Old World, but as a game mechanic in EU5, it only makes sense to model the lethal tropical strains that prevented colonization and settlement during this time period.
What this mod does:
Therefore, this mod removes malaria from Northern Africa (Mahgreb and Egypt regions) and the South Africa region. It also adds it to the Melanesia region (Papua New Guinea and surrounding islands) which was another historical malaria hotspot that slowed colonization.
This mod also tweaks the malaria spread/death tick from 10-15 days to 30-45 days because the current 10-15 day tick is shorter than the monthly colonization tick, which effectively makes colonizing take infinitely long wherever malaria is present. (Don’t get me wrong, malaria should inhibit colonization, but not outright prevent it.) See example explanation at the bottom of this text. To compensate for the longer tick, the infection rate is increased from 10% to 30%.
Example problem with 10-15 day malaria spread/death tick:
Let’s say my 100% colonization threshold for a province is 1000, and I have 900 colonists already. Even if my colonial migration is say, 250, only 100 will actually arrive because the game caps arrivals to the threshold.
Once the 1000 threshold is met, if it stays 1000 until the next monthly tick/check, the game considers the location 100% colonized and moves on to the next province.
You might see where I’m going with this: if the tick for malaria spread/death is only 10-15 days, some colonists are going to die before the next 100% colonization check. And it gets stuck in a loop of getting up to 1000 colonists, some dying, sending up to 1000 again, some dying, without ever having a chance to consolidate.
So, by increasing the malaria tick to 30-45 days, it gives the game enough time for colonization to consolidate and move on to the next location. This allows colonization to proceed at a rightfully slow pace in malaria areas, but not infinitely slow.
